LT-7T Series T1+T2 Surge Protector N-PE Lightning
A T1+T2 surge protective device which combines the two protection levels and can deal with directly stricken lightning and surge strikes. As a direct manufacturer and supplier of SPDs, Leitai Electric provides surge protection devices in factory prices and customized configurations along with required technical documentation.
Applications & circuit protection
The LT-7T / LT-12.5T is utilized where N-PE mode lightning current protection is needed for TN systems, incorporating Type 1 impulse currents and Type 2 discharges. This product is employed in the following locations.
- N-PE: Lightning path from neutral to ground.
- TN systems: T1 + T2 lightning protection.
- Main distribution: Service entrance protection.
- Lightning protection zone: Transition from LPZ 0B to LPZ 1.
Schematic Diagram
The scheme appearing above demonstrates how the LT-7T / LT-12.5T surge protection device works internally, as well as how it is connected.
Construction & operating reliability
The LT-7T / LT-12.5T uses MOV technology and gas discharge tubes (GDT) for reliable protection against surges.
The LT-7T / LT-12.5T is produced on separate production lines and checked at every major step.
- MOV + GDT combination technology, quick operation and no leakage.
- Thermal isolation device visual indicator.
- IP20 housing with flame-resistant UL94 V0 rating.
- Tested according to IEC 61643-11 and GB/T18802.11 standard.
T1+T2 Surge Protector Technical Specification & Selection Guide
| Technical Data | Value |
|---|---|
| Uc | 255V |
| Un | 220V |
| Iimp | 7kA |
| Uoc | 20kV |
| Up | 1.25kV |
T1+T2 Surge Protector Sales & Wholesale: Get the Factory Quote
The pricing for the LT-7T and LT-12.5T is taken from the factory price list depending upon the number and configuration of the things ordered. The export team may be contacted for a written quote.
- Standard price is from the factory price list
- Custom configurations as per the client’s request
- Written quote against the specifications provided
How to Install and Connect T1+T2 Surge Protector
Please connect the LT-7T / LT-12.5T SPD to the live wires and the earth by using the shortest practical lead lengths. Make sure the polarity is right and also check the terminal torque according to the datasheet, and make sure to protect the connection using the recommended external disconnector.
- In parallel and using lead wire
- External disconnector in accordance with GF norms.
- Check the circuit diagram provided in the instruction.
Wiring Diagram
The above connection diagram indicates the arrangement of wiring for the LT-7T / LT-12.5T in a common distribution box with L, N and PE points labelled in accordance with international norms.
T1+T2 Surge Protector Comparison Guide: Choose the Right Option
When selecting SPD devices, do not forget to pay attention to their protection rating (Up), as well as discharge rates (In/Imax or Iimp) and standard compliance. Our experts can help you select the gear that you need for you network.
| Feature | This SPD | Alternative |
| Type | Type 1+2 (T1+T2) SPD (N-PE) | Other SPD types available |
| Discharge capacity | Per specification / 7kA | Matched to network duty |
| Protection level | 1.25kV | Lower Up options available |
| Application | Lightning Protection | Other installation types |
Export Markets & Country Compatibility
Our SPDs are distributed to our partner companies all over the world in compliance with the required voltage, grounding systems and standards of a certain country.
SPD Dimensions, Weight & Packing
The LT-7T / LT-12.5T is both compact and modular and can be easily mounted on a distribution board’s DIN rail. Full dimensional and packaging information is provided in product data sheets.
- Compact DIN-rail profile for panel mounting
- Terminal connections are also safeguarded
- Dimension drawing per model is supplied
Dimensional Drawing
The LT-7T and LT-12.5T mounting dimensions are shown in the figure above for DIN rail installation.
Standards & certifications
The LT-7T / LT-12.5T surge protective device complies with IEC 61643-11 and GB/T 18802.11. Type and routine test certificates are available according to your project specifications.
- Design standard: IEC 61643-11 / GB/T 18802.11.
- Certifications: CE (depending on model).
- Markings are standard in terms of terminals and wiring polarity.
- The device is suitable for installation on the DIN rail in the distribution board.
OEM & B2B supply support
The company has OEM, wholesale and distribution programs for SPDs. Marking, branding and packaging options can also be provided.
In case the configuration of LT-7T/BG LT-12.5T does not fit your project, please inform us about the specification of type, discharge capacity, voltage and quantity. Please inform us about the type, discharge capacity, voltage and quantity needed to obtain factory pricing!
- There are samples available for product evaluation.
- We provide flexible quantity for projects and B2B purposes.
- We offer OEM and ODM support in suitable projects.
- There are marking, branding and packaging options available.
- We provide technical documentation and certification support.
Frequently Asked Questions About T1+T2 Surge Protector
What standards apply?
The T1 + T2 Surged Protective Device can be tested by the standard of IEC 61643-11 / GB/T 18802.11, and there are documents available for its type-testing.
Does a T1+T2 SPD need additional Type 3 protection?
In order to protect sensitive equipment, a Type 3 SPD must be placed close to the equipment so that they synchronize with each other.
What is Iimp of the LT-7T / LT-12.5T?
The Iimp is mentioned in the specification of LT-7T / LT-12.5T with a value between (e.g. 6.25kA-25kA, 10/350us), which shows the amount of the current flowing through it.
Can I order samples for testing?
Of course, samples of the equipment can be ordered, and a competitive price can be provided for B2B companies.
What is a Type 1+2 SPD?
Type 1+2 SPD uses the principle of lightning protection which can discharge both lightning and surge, meaning that it provides the lightning discharge capacity (10/350us) and surge (8/20us).
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